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/* Etsy registration verification with a browser-inbox continuity path. */
(function () {
  "use strict";

  var form = document.querySelector("[data-external-registration]");
  if (!form) { return; }
  var email = form.querySelector("[data-auth-email]");
  var code = form.querySelector("[data-auth-code]");
  var codePanel = form.querySelector("[data-auth-code-panel]");
  var send = form.querySelector("[data-auth-send-code]");
  var verify = form.querySelector("[data-auth-verify-code]");
  var create = form.querySelector("[data-auth-create-account]");
  var status = form.querySelector("[data-auth-verification-status]");
  var fallback = form.querySelector("[data-auth-fallback]");
  if (!email || !code || !codePanel || !send || !verify || !create || !status || !fallback) { return; }

  var verifiedEmail = "";

  function setStatus(message, state) {
    status.textContent = message;
    if (state) { status.dataset.state = state; }
    else { delete status.dataset.state; }
  }

  function reset(message) {
    verifiedEmail = "";
    fallback.value = "";
    create.disabled = true;
    code.value = "";
    setStatus(message || "");
  }

  function useBrowserInbox() {
    verifiedEmail = "";
    fallback.value = "browser-inbox";
    code.value = "";
    code.required = false;
    codePanel.hidden = true;
    create.disabled = false;
    setStatus(
      "Email delivery could not be completed. Select Create account to continue with browser verification.",
      "notice"
    );
  }

  async function postJson(path, payload) {
    var response = await fetch(path, {
      method: "POST",
      credentials: "same-origin",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload)
    });
    var data = {};
    try { data = await response.json(); } catch (error) { data = {}; }
    return { response: response, data: data };
  }

  email.addEventListener("input", function () {
    if (email.value.trim().toLowerCase() !== verifiedEmail) { reset(); }
  });

  send.addEventListener("click", async function () {
    if (!email.checkValidity()) { email.reportValidity(); return; }
    reset("Sending a verification code…");
    send.disabled = true;
    var normalized = email.value.trim().toLowerCase();
    try {
      var result = await postJson("/api/auth/send-code", { email: normalized });
      if (result.response.status === 202 && result.data.ok === true) {
        codePanel.hidden = false;
        code.required = true;
        code.focus();
        setStatus("A six-digit code was sent. It expires in 5 minutes.", "success");
      } else if (result.response.status === 429) {
        setStatus("Too many verification requests. Please wait before trying again.", "error");
      } else if (result.response.status === 503 || result.data.error === "verification_unavailable") {
        useBrowserInbox();
      } else {
        setStatus("We couldn't send a code. Check the email address and try again.", "error");
      }
    } catch (error) {
      useBrowserInbox();
    } finally {
      send.disabled = false;
    }
  });

  verify.addEventListener("click", async function () {
    var normalized = email.value.trim().toLowerCase();
    if (!/^[0-9]{6}$/.test(code.value.trim())) {
      setStatus("Enter the six-digit verification code.", "error");
      code.focus();
      return;
    }
    verify.disabled = true;
    setStatus("Checking the verification code…");
    try {
      var result = await postJson("/api/auth/verify-code", {
        email: normalized,
        code: code.value.trim()
      });
      if (result.response.ok && result.data.ok === true) {
        verifiedEmail = normalized;
        create.disabled = false;
        setStatus("Email verified. Complete the form and select Create account.", "success");
      } else if (result.response.status === 423) {
        reset("Too many incorrect attempts. Request a new code after 15 minutes.");
        status.dataset.state = "error";
      } else if (result.response.status === 410) {
        reset("This code expired. Request a new code.");
        status.dataset.state = "error";
      } else if (result.response.status === 503) {
        useBrowserInbox();
      } else {
        setStatus("That verification code is not valid.", "error");
      }
    } catch (error) {
      useBrowserInbox();
    } finally {
      verify.disabled = false;
    }
  });

  form.addEventListener("submit", function (event) {
    if (fallback.value === "browser-inbox") { return; }
    if (!verifiedEmail || verifiedEmail !== email.value.trim().toLowerCase()) {
      event.preventDefault();
      setStatus("Verify this email address before continuing.", "error");
    }
  });
})();